We need Android Studio for Android application development. Initially, we were using Eclipse and the Android team was providing good support with ADT release, but now it's better that we have moved to Android Studio, which has been developed by IntelliJ IDEA. We should quickly cover the development environment-related information here. The installation is straightforward. Please refer to Android's developer website: https://developer.android.com/studio/install.html for any setup and installation related help.
Android Studio 3.0 has come up recently and has built-in support for Kotlin. We recommend using that now. And those who have Android Studio 2.3 or lower need the Kotlin plugin setup. You can find all the relevant information at https://kotlinlang.org/docs/tutorials/kotlin-android.html.